Duncan Chard/Bloomberg via Getty Images(TOKYO) -- The investigation into Boeing's 787 Dreamliner is now shifting from the battery maker to the company that manufactures its monitoring system.

On Monday, Japan's Transport Ministry said its inspectors and the Federal Aviation Administration found no problems with production at GS Yuasa. The company's lithium-ion batteries have been at the center of an investigation into one of Boeing's grounded Dreamliners, until now.

Now, inspectors are checking the system that monitors the battery's voltage and temperature.